Context:

List of tenses: simple past, past perfect, past continuous, past perfect continuous, simple present, present perfect, present continuous, present perfect continuous, simple future, future perfect, future continuous, or future perfect continuous.

Task:

Read the following sentence: {sentence}.

What tenses are used in the sentence?

Instructions:

1. Think through the problem step-by-step, but provide only the final answer as a JSON object.
2. Only use the provided tenses as answers.
3. The expected JSON format is: {{"tenses": {{"tense 1": "tense", "tense 2": "tense", ...}}}}.